Instagram posts bearing the name of the suspected Gilroy Garlic Festival gunman mentioned a white supremacist book and showed a picture of people walking around the event, shortly before the shooting began.

The suspect — identified by two law enforcement officials as Santino William Legan, 19 — apparently entered the annual festival, which attracts about 100,000 people every year, by cutting through a back fence and then began shooting at random, Gilroy Police Chief Scot Smithee said.
Three people were killed in the Sunday evening attack, including a 6-year-old, and at least 12 others were injured before the gunman was fatally shot by police, authorities said.